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Mergers and Acquisitions - Summary of the Allocation of Purchase Price to Assets and Liabilities Acquired (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Sep. 01, 2018 | Jul. 01, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Purchase Price: |  |  |  |  |
Common stock issued in acquisition of businesses |  |  | $ 434,519 | $ 213,590 | $ 55,290
Increase (decrease) to net assets as a result of fair value adjustments to assets acquired and liabilities assumed: |  |  |  |  |
Goodwill resulting from merger |  |  | $ 932,928 | $ 611,046 | $ 470,534
Brand Group Holdings, Inc. |  |  |  |  |
Purchase Price: |  |  |  |  |
Shares issued to common shareholders (in shares) | 9,306,477 |  |  |  |
Purchase price per share (usd per share) | $ 46.69 |  |  |  |
Common stock issued in acquisition of businesses | $ 434,519 |  |  |  |
Cash consideration paid | 21,879 |  |  |  |
Cash paid for fractional shares | 4 |  |  |  |
Cash settlement for stock options | 17,157 |  |  |  |
Deal charges, net of taxes | 894 |  |  |  |
Total Purchase Price | 474,453 |  |  |  |
Increase (decrease) to net assets as a result of fair value adjustments to assets acquired and liabilities assumed: |  |  |  |  |
Securities | (231) |  |  |  |
Loans, net of Metropolitan’s allowance for loan losses | (20,926) |  |  |  |
Premises and equipment | 910 |  |  |  |
Intangible assets, net of Metropolitan’s existing intangibles | 27,534 |  |  |  |
Other assets | (3,304) |  |  |  |
Deposits | (1,367) |  |  |  |
Borrowings | (3,236) |  |  |  |
Other liabilities | 13,338 |  |  |  |
Deferred income taxes | 957 |  |  |  |
Total net assets acquired | 152,571 |  |  |  |
Goodwill resulting from merger | 321,882 |  |  |  |
Brand Group Holdings, Inc. | Brand Group Holdings, Inc. |  |  |  |  |
Net Assets Acquired: |  |  |  |  |
Stockholders’ equity at acquisition date | $ 138,896 |  |  |  |
Metropolitan Bancgroup, Inc. |  |  |  |  |
Purchase Price: |  |  |  |  |
Shares issued to common shareholders (in shares) |  | 4,883,182 |  |  |
Purchase price per share (usd per share) |  | $ 43.74 |  |  |
Common stock issued in acquisition of businesses |  | $ 213,590 |  |  |
Cash paid for fractional shares |  | 5 |  |  |
Cash settlement for stock options |  | 4,764 |  |  |
Deal charges, net of taxes |  | 1,102 |  |  |
Total Purchase Price |  | 219,461 |  |  |
Increase (decrease) to net assets as a result of fair value adjustments to assets acquired and liabilities assumed: |  |  |  |  |
Securities |  | (731) |  |  |
Mortgage loans held for sale |  | 30 |  |  |
Loans, net of Metropolitan’s allowance for loan losses |  | (13,071) |  |  |
Premises and equipment |  | (4,629) |  |  |
Intangible assets, net of Metropolitan’s existing intangibles |  | 2,340 |  |  |
Other real estate owned |  | (1,251) |  |  |
Other assets |  | 2,731 |  |  |
Deposits |  | (3,603) |  |  |
Borrowings |  | (1,294) |  |  |
Other liabilities |  | 3,930 |  |  |
Deferred income taxes |  | 5,244 |  |  |
Total net assets acquired |  | 78,949 |  |  |
Goodwill resulting from merger |  | 140,512 |  |  |
Metropolitan Bancgroup, Inc. | Metropolitan Bancgroup, Inc. |  |  |  |  |
Net Assets Acquired: |  |  |  |  |
Stockholders’ equity at acquisition date |  | $ 89,253 |  |  |

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